.nested-fields.plant-density-abacus
  = link_to_remove_nested_association(:plant_density_abacus, f)
  = f.input :name
  = f.input :seeding_density_unit, collection: Nomen::Unit.where(dimension: :surface_area_density).selection, include_blank: false, input_html: { class: "counting-seeding-density" }
  = f.input :sampling_length_unit, collection: Nomen::Unit.where(dimension: :distance).selection, include_blank: false, input_html: { class: "counting-sampling-length" }
  = f.input :germination_percentage, wrapper: :append, required: true do
    = f.input_field :germination_percentage
    %span.add-on %

  = f.nested_association :items
